mcclock_gbus.c revision 1.3 
1/* $NetBSD: mcclock_gbus.c,v 1.3 2024/03/06 05:44:44 thorpej Exp $ */
2
3/*
4 * Copyright (c) 1997 by Matthew Jacob
5 * NASA AMES Research Center.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice immediately at the beginning of the file, without modification,
13 *    this list of conditions, and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. The name of the author may not be used to endorse or promote products
18 *    derived from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
24 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#include <sys/cdefs.h>			/* RCS ID & Copyright macro defns */
34
35__KERNEL_RCSID(0, "$NetBSD: mcclock_gbus.c,v 1.3 2024/03/06 05:44:44 thorpej Exp $");
36
37#include <sys/param.h>
38#include <sys/kernel.h>
39#include <sys/systm.h>
40#include <sys/device.h>
41
42#include <sys/bus.h>
43
44#include <alpha/gbus/gbusvar.h>
45
46#include <dev/clock_subr.h>
47
48#include <dev/ic/mc146818reg.h>
49#include <dev/ic/mc146818var.h>
50
51#include <alpha/alpha/mcclockvar.h>
52
53#include "ioconf.h"
54
55static int	mcclock_gbus_match(device_t, cfdata_t, void *);
56static void	mcclock_gbus_attach(device_t, device_t, void *);
57
58CFATTACH_DECL_NEW(mcclock_gbus, sizeof(struct mc146818_softc),
59    mcclock_gbus_match, mcclock_gbus_attach, NULL, NULL);
60
61static void	mcclock_gbus_write(struct mc146818_softc *, u_int, u_int);
62static u_int	mcclock_gbus_read(struct mc146818_softc *, u_int);
63
64static int
65mcclock_gbus_match(device_t parent, cfdata_t cf, void *aux)
66{
67	struct gbus_attach_args *ga = aux;
68
69	if (strcmp(ga->ga_name, mcclock_cd.cd_name))
70		return (0);
71	return (1);
72}
73
74static void
75mcclock_gbus_attach(device_t parent, device_t self, void *aux)
76{
77	struct mc146818_softc *sc = device_private(self);
78	struct gbus_attach_args *ga = aux;
79
80	sc->sc_dev = self;
81	sc->sc_bst = ga->ga_iot;
82
83	if (bus_space_map(sc->sc_bst, ga->ga_offset, MC_NREGS+MC_NVRAM_SIZE,
84			  0, &sc->sc_bsh) != 0) {
85		panic("mcclock_gbus_attach: couldn't map clock I/O space");
86	}
87
88	sc->sc_mcread  = mcclock_gbus_read;
89	sc->sc_mcwrite = mcclock_gbus_write;
90
91	mcclock_attach(sc);
92}
93
94static void
95mcclock_gbus_write(struct mc146818_softc *sc, u_int reg, u_int val)
96{
97	bus_space_write_1(sc->sc_bst, sc->sc_bsh, reg, (uint8_t)val);
98}
99
100static u_int
101mcclock_gbus_read(struct mc146818_softc *sc, u_int reg)
102{
103	return bus_space_read_1(sc->sc_bst, sc->sc_bsh, reg);
104}
105